{"id":3777,"date":"2018-10-30T21:12:29","date_gmt":"2018-10-30T20:12:29","guid":{"rendered":"http:\/\/roboblog.fatal-fury.de\/?p=3777"},"modified":"2018-10-30T21:12:29","modified_gmt":"2018-10-30T20:12:29","slug":"c-guns-disable-function-with-concepts-without-sfinae-stdenable_if","status":"publish","type":"post","link":"http:\/\/roboblog.fatal-fury.de\/?p=3777","title":{"rendered":"C++ Guns: disable function with concepts without SFINAE std::enable_if"},"content":{"rendered":"

std::enable_if is dead; long live concepts!<\/p>\n

Man beachte, dass die Requires clause NACH dem Funktionskopf kommen kann. <\/p>\n

\r\n#include <type_traits>\r\n\r\ntemplate<typename T>\r\nvoid func(T) requires std::is_integral_v<T> {\r\n}\r\n\r\nauto func2() {\r\n    \/\/ error: cannot call function 'void func(T) requires  is_integral_v<T> [with T = double]'\r\n    \/\/ constraints not satisfied  'is_integral_v<T>' evaluated to false\r\n   func(2.0); \/\/ Nope\r\n}\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"
std::enable_if is dead; long live concepts! Man beachte, dass die Requires clause NACH dem Funktionskopf kommen kann. #include <type_traits> template<typename T> void func(T) requires std::is_integral_v<T> { } auto func2() { \/\/ error: cannot call function 'void func(T) requires is_integral_v<T> [with T = double]' \/\/ constraints not satisfied 'is_integral_v<T>' evaluated to false func(2.0); \/\/ Nope }<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[17],"class_list":["post-3777","post","type-post","status-publish","format-standard","hentry","category-allgemein","tag-cpp"],"_links":{"self":[{"href":"http:\/\/roboblog.fatal-fury.de\/index.php?rest_route=\/wp\/v2\/posts\/3777","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/roboblog.fatal-fury.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/roboblog.fatal-fury.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/roboblog.fatal-fury.de\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/roboblog.fatal-fury.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3777"}],"version-history":[{"count":4,"href":"http:\/\/roboblog.fatal-fury.de\/index.php?rest_route=\/wp\/v2\/posts\/3777\/revisions"}],"predecessor-version":[{"id":3781,"href":"http:\/\/roboblog.fatal-fury.de\/index.php?rest_route=\/wp\/v2\/posts\/3777\/revisions\/3781"}],"wp:attachment":[{"href":"http:\/\/roboblog.fatal-fury.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3777"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/roboblog.fatal-fury.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3777"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/roboblog.fatal-fury.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3777"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}